mysql插入多个select语句

Question

我想将数据插入到包含3个不同表的值

的表中

table class_teachers_section
    class_ref teachers_ref section_ref
        2 3 2         1 6 2

表类      id名称小时      1 pe 3

表教师      id first_name last_name       1 Lenovo Lenovo

表格部分       id名称        1年级4个

class_teachers_section是一个中间表...这是我的陈述

INSERT INTO class_teachers_section(class_ref, teachers_ref, section_ref)
    values (
        (class_ref, (select class.id as class_ref from class where class.name = 'pe')),
        (teachers_ref, (select teachers.id as teachers_ref from teachers where
                    teachers.last_name = 'lenevo')),
        (section_ref, (select section.id as section_ref from section where section.name =
                   'grade 4'))
    )

1241 - 操作数应包含1列

你们有任何想法如何解决这个问题吗？感谢

尝试了这个..

INSERT INTO class_teachers_section(class_ref, teachers_ref, section_ref)
    values( (select class.id as class_ref from class where class.name = 'pe'),
           (select teachers.id as teachers_ref from teachers where teachers.last_name = 'lenevo'),
           (select section.id as section_ref from section where section.name = 'grade 4'))

teachers_ref不能为空错误

Answer 1

你的语法很不寻常。 insert列表中有三列，但values列表中有六个元素。其中三个似乎是列名。

这不是select的工作原理。相反，列对应的位置。

但是，在您的情况下，您应该使用insert . . . select：

INSERT INTO class_teachers_section(class_ref, teachers_ref, section_ref)
    select (select class.id as class_ref from class where class.name = 'pe'),
           (select teachers.id as teachers_ref from teachers where teachers.last_name = 'lenevo'),
           (select section.id as section_ref from section where section.name = 'grade 4');